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TI RTOS Wifi example TM4C123GXL Connection issues

Daniel Vamos
Genius 3950 points
Other Parts Discussed in Thread: CC3200, CC3100, EK-TM4C123GXL

Hey,

I would like to find explanation for the following issue. I am using the TI RTOS (2.16.0.08) Wifi example for TivaC launchpad. (tcpEchoCC3X00_EK_TM4C123GXL_TI_TivaTM4C123GH6PM) I did everything that the readme suggested and I could successfully configure and connect my LP to the home wifi network.

My problem is when I restart the LP it can not connect to the home wifi every time when I restart it. No IP displayed on the Console, and the RGB led doesn't change the color from blue only several times. I increased the time btw restarts but nothing changes.

The distance btw the LP and wifi router (TL-WDR3600) is less than 5 meters.

Have you faced similar issue like this one? Looking forward any reply.

Thank you

  • 0
    TI__Guru* 85400 points
    Moving to TI-RTOS Forum

    Regards,
    Gigi Joseph.
  • 0
    Genius 3950 points

    Hello,

    New info! Here are some states when I can reproduce the connection failure. 

    Problem: After reset or power up LP can not connect back to the AP that was configured last time with WifI-Started android app.

    1. If the J8 power jumper is in MCU state and the LP is powered only from USB debug port . Using CCS, for every debug the system can connect to AP every time when I start debugging. ( The LP remain powered this time.)
    2. When I press the reset button for 5 - 8sec on LP for - sec and release it, the system reconnect every time. ( This time as above the booster pack is powered by externally as the LP via debug usb port.)
    3. Same confuguration as above, but I am using PWR switch on the LP to reset the LP, it can connect to AP  for every 2nd or 3rd time of a trials.
    4. When I set the boosterpack power jumper to MCU state, (system is powered only from USB Debug port of LP) and start debugging with CCS it can connect to AP for every 10th of my trials. (Randomly)

    My conclusion:this booster pack must be powered externally when TM4C123GXL is used with it for development. I am not sure about this could work stable on the field. Do I miss something? My CC3200 LP is coming and I would like to repeat the trials with that.

  • 0 in reply to Daniel Vamos
    TI__Intellectual 2890 points

    Hi Daniel,

    You’re correct in your diagnosis of the intermittent connectivity problems stemming from not powering the CC3100 directly. When debugging you’re application, the USB power you’re supplying must go through the on board regulator which has a maximum current output of 400 mA, see below.

    Also from section 2.4 of the CC3100 Users Guide they state that it must be externally powered as the radio may be required to source up to 350 mA during certain WiFi operations. 

    As such, that only leaves a maximum of ~50 mA of current for the actual chip and and GPIO's you may be using in your application, which is why it may connect sometimes and not others.

    Sources:

    EK-TM4C123GXL Launchpad Users Guide (http://www.ti.com/lit/ug/spmu296/spmu296.pdf)

    CC3100 Users Guide (http://www.ti.com/lit/ug/swru371b/swru371b.pdf)

    Best,

    Alexander

  • 0 in reply to Aldabreu
    Genius 3950 points
    Hey Alexander,

    Thank you for your reply! That makes sense right now.
    I should have read more the User Guide.

    All the best,
  • 0 in reply to Daniel Vamos
    TI__Intellectual 2890 points
    No Problem. Going ahead and closing the thread.